2 * SPDX-License-Identifier: MIT
4 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 #ifndef _LTTNG_TRACEPOINT_H
8 #define _LTTNG_TRACEPOINT_H
12 #include <lttng/tracepoint-types.h>
13 #include <lttng/tracepoint-rcu.h>
14 #include <urcu/compiler.h>
15 #include <urcu/system.h>
16 #include <dlfcn.h> /* for dlopen */
17 #include <string.h> /* for memset */
19 #include <lttng/ust-config.h> /* for sdt */
20 #include <lttng/ust-compiler.h>
21 #include <lttng/ust-tracer.h>
22 #include <lttng/ust-api-compat.h>
24 #define LTTNG_UST_TRACEPOINT_NAME_LEN_MAX 256
26 #ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
28 * Instead of using SDT_USE_VARIADIC from 'sys/sdt.h', use our own namespaced
29 * macros since the instrumented application might already have included
30 * 'sys/sdt.h' without variadic support.
34 #define LTTNG_UST__SDT_NARG(...) \
35 LTTNG_UST___SDT_NARG(__VA_ARGS__, 12,11,10,9,8,7,6,5,4,3,2,1,0)
37 #define LTTNG_UST___SDT_NARG(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12, N, ...) N
39 #define LTTNG_UST__SDT_PROBE_N(provider, name, N, ...) \
40 _SDT_PROBE(provider, name, N, (__VA_ARGS__))
42 #define LTTNG_UST_STAP_PROBEV(provider, name, ...) \
43 LTTNG_UST__SDT_PROBE_N(provider, name, LTTNG_UST__SDT_NARG(0, ##__VA_ARGS__), ##__VA_ARGS__)
46 #define LTTNG_UST_STAP_PROBEV(...)
53 #define lttng_ust_tracepoint_enabled(provider, name) \
54 caa_unlikely(CMM_LOAD_SHARED(lttng_ust_tracepoint_##provider##___##name.state))
56 #define lttng_ust_do_tracepoint(provider, name, ...) \
57 lttng_ust_tracepoint_cb_##provider##___##name(__VA_ARGS__)
59 #define lttng_ust_tracepoint(provider, name, ...) \
61 LTTNG_UST_STAP_PROBEV(provider, name, ## __VA_ARGS__); \
62 if (lttng_ust_tracepoint_enabled(provider, name)) \
63 lttng_ust_do_tracepoint(provider, name, __VA_ARGS__); \
66 #define LTTNG_UST_TP_ARGS(...) __VA_ARGS__
69 * LTTNG_UST_TP_ARGS takes tuples of type, argument separated by a comma.
70 * It can take up to 10 tuples (which means that less than 10 tuples is
72 * Each tuple is also separated by a comma.
74 #define LTTNG_UST___TP_COMBINE_TOKENS(_tokena, _tokenb) \
76 #define LTTNG_UST__TP_COMBINE_TOKENS(_tokena, _tokenb) \
77 LTTNG_UST___TP_COMBINE_TOKENS(_tokena, _tokenb)
78 #define LTTNG_UST___TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
79 _tokena##_tokenb##_tokenc
80 #define LTTNG_UST__TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
81 LTTNG_UST___TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc)
82 #define LTTNG_UST___TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
83 _tokena##_tokenb##_tokenc##_tokend
84 #define LTTNG_UST__TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
85 LTTNG_UST___TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend)
88 * LTTNG_UST__TP_EXVAR* extract the var names.
89 * LTTNG_UST__TP_EXVAR1 and LTTNG_UST__TP_EXDATA_VAR1 are needed for -std=c99.
91 #define LTTNG_UST__TP_EXVAR0()
92 #define LTTNG_UST__TP_EXVAR1(a)
93 #define LTTNG_UST__TP_EXVAR2(a,b) b
94 #define LTTNG_UST__TP_EXVAR4(a,b,c,d) b,d
95 #define LTTNG_UST__TP_EXVAR6(a,b,c,d,e,f) b,d,f
96 #define LTTNG_UST__TP_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h
97 #define LTTNG_UST__TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j
98 #define LTTNG_UST__TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l
99 #define LTTNG_UST__TP_EXVAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) b,d,f,h,j,l,n
100 #define LTTNG_UST__TP_EXVAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) b,d,f,h,j,l,n,p
101 #define LTTNG_UST__TP_EXVAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) b,d,f,h,j,l,n,p,r
102 #define LTTNG_UST__TP_EXVAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) b,d,f,h,j,l,n,p,r,t
104 #define LTTNG_UST__TP_EXDATA_VAR0() __tp_data
105 #define LTTNG_UST__TP_EXDATA_VAR1(a) __tp_data
106 #define LTTNG_UST__TP_EXDATA_VAR2(a,b) __tp_data,b
107 #define LTTNG_UST__TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d
108 #define LTTNG_UST__TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f
109 #define LTTNG_UST__TP_EXDATA_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h
110 #define LTTNG_UST__TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j
111 #define LTTNG_UST__TP_EXDATA_VAR12(a,b,c,d,e,f,g,h,i,j,k,l) __tp_data,b,d,f,h,j,l
112 #define LTTNG_UST__TP_EXDATA_VAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) __tp_data,b,d,f,h,j,l,n
113 #define LTTNG_UST__TP_EXDATA_VAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) __tp_data,b,d,f,h,j,l,n,p
114 #define LTTNG_UST__TP_EXDATA_VAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) __tp_data,b,d,f,h,j,l,n,p,r
115 #define LTTNG_UST__TP_EXDATA_VAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) __tp_data,b,d,f,h,j,l,n,p,r,t
118 * LTTNG_UST__TP_EXPROTO* extract tuples of type, var.
119 * LTTNG_UST__TP_EXPROTO1 and LTTNG_UST__TP_EXDATA_PROTO1 are needed for -std=c99.
121 #define LTTNG_UST__TP_EXPROTO0() void
122 #define LTTNG_UST__TP_EXPROTO1(a) void
123 #define LTTNG_UST__TP_EXPROTO2(a,b) a b
124 #define LTTNG_UST__TP_EXPROTO4(a,b,c,d) a b,c d
125 #define LTTNG_UST__TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f
126 #define LTTNG_UST__TP_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h
127 #define LTTNG_UST__TP_EXPROTO10(a,b,c,d,e,f,g,h,i,j) a b,c d,e f,g h,i j
128 #define LTTNG_UST__TP_EXPROTO12(a,b,c,d,e,f,g,h,i,j,k,l) a b,c d,e f,g h,i j,k l
129 #define LTTNG_UST__TP_EXPROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) a b,c d,e f,g h,i j,k l,m n
130 #define LTTNG_UST__TP_EXPROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) a b,c d,e f,g h,i j,k l,m n,o p
131 #define LTTNG_UST__TP_EXPROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) a b,c d,e f,g h,i j,k l,m n,o p,q r
132 #define LTTNG_UST__TP_EXPROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) a b,c d,e f,g h,i j,k l,m n,o p,q r,s t
134 #define LTTNG_UST__TP_EXDATA_PROTO0() void *__tp_data
135 #define LTTNG_UST__TP_EXDATA_PROTO1(a) void *__tp_data
136 #define LTTNG_UST__TP_EXDATA_PROTO2(a,b) void *__tp_data,a b
137 #define LTTNG_UST__TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d
138 #define LTTNG_UST__TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f
139 #define LTTNG_UST__TP_EXDATA_PROTO8(a,b,c,d,e,f,g,h) void *__tp_data,a b,c d,e f,g h
140 #define LTTNG_UST__TP_EXDATA_PROTO10(a,b,c,d,e,f,g,h,i,j) void *__tp_data,a b,c d,e f,g h,i j
141 #define LTTNG_UST__TP_EXDATA_PROTO12(a,b,c,d,e,f,g,h,i,j,k,l) void *__tp_data,a b,c d,e f,g h,i j,k l
142 #define LTTNG_UST__TP_EXDATA_PROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) void *__tp_data,a b,c d,e f,g h,i j,k l,m n
143 #define LTTNG_UST__TP_EXDATA_PROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p
144 #define LTTNG_UST__TP_EXDATA_PROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r
145 #define LTTNG_UST__TP_EXDATA_PROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r,s t
147 /* Preprocessor trick to count arguments. Inspired from sdt.h. */
148 #define LTTNG_UST__TP_NARGS(...) LTTNG_UST___TP_NARGS(__VA_ARGS__, 20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
149 #define LTTNG_UST___TP_NARGS(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20, N, ...) N
150 #define LTTNG_UST__TP_PROTO_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXPROTO, N)(__VA_ARGS__))
151 #define LTTNG_UST__TP_VAR_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXVAR, N)(__VA_ARGS__))
152 #define LTTNG_UST__TP_DATA_PROTO_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXDATA_PROTO, N)(__VA_ARGS__))
153 #define LTTNG_UST__TP_DATA_VAR_N(N, ...) LTTNG_UST__TP_PARAMS(LTTNG_UST__TP_COMBINE_TOKENS(LTTNG_UST__TP_EXDATA_VAR, N)(__VA_ARGS__))
154 #define LTTNG_UST__TP_ARGS_PROTO(...) LTTNG_UST__TP_PROTO_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
155 #define LTTNG_UST__TP_ARGS_VAR(...) LTTNG_UST__TP_VAR_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
156 #define LTTNG_UST__TP_ARGS_DATA_PROTO(...) LTTNG_UST__TP_DATA_PROTO_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
157 #define LTTNG_UST__TP_ARGS_DATA_VAR(...) LTTNG_UST__TP_DATA_VAR_N(LTTNG_UST__TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
158 #define LTTNG_UST__TP_PARAMS(...) __VA_ARGS__
161 * sizeof(#_provider) - 1 : length of the provider string (excluding \0).
162 * sizeof(#_name) - 1 : length of the name string (excluding \0).
163 * + 1 : separator between provider and event name.
165 * Upper bound (inclusive) is LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1 to
169 * left hand side: sizeof(#_provider) - 1 + sizeof(#_name) - 1 + 1
170 * right hand side: LTTNG_UST_TRACEPOINT_NAME_LEN_MAX - 1
171 * operator: <= (inclusive)
172 * Simplified in the code below.
174 #define lttng_ust_tracepoint_validate_name_len(_provider, _name) \
175 lttng_ust_static_assert(sizeof(#_provider) + sizeof(#_name) <= LTTNG_UST_TRACEPOINT_NAME_LEN_MAX, \
176 "Tracepoint name length is too long", \
177 Tracepoint_name_length_is_too_long)
180 * The tracepoint cb is marked always inline so we can distinguish
181 * between caller's ip addresses within the probe using the return
184 #define LTTNG_UST__DECLARE_TRACEPOINT(_provider, _name, ...) \
185 extern struct lttng_ust_tracepoint lttng_ust_tracepoint_##_provider##___##_name; \
187 void lttng_ust_tracepoint_cb_##_provider##___##_name(LTTNG_UST__TP_ARGS_PROTO(__VA_ARGS__)) \
188 __attribute__((always_inline, unused)) lttng_ust_notrace; \
190 void lttng_ust_tracepoint_cb_##_provider##___##_name(LTTNG_UST__TP_ARGS_PROTO(__VA_ARGS__)) \
192 struct lttng_ust_tracepoint_probe *__tp_probe; \
194 if (caa_unlikely(!LTTNG_UST_TP_RCU_LINK_TEST())) \
196 lttng_ust_tp_rcu_read_lock(); \
197 __tp_probe = lttng_ust_tp_rcu_dereference(lttng_ust_tracepoint_##_provider##___##_name.probes); \
198 if (caa_unlikely(!__tp_probe)) \
201 void (*__tp_cb)(void) = __tp_probe->func; \
202 void *__tp_data = __tp_probe->data; \
204 URCU_FORCE_CAST(void (*)(LTTNG_UST__TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \
205 (LTTNG_UST__TP_ARGS_DATA_VAR(__VA_ARGS__)); \
206 } while ((++__tp_probe)->func); \
208 lttng_ust_tp_rcu_read_unlock(); \
211 void lttng_ust_tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
212 void (*func)(void), void *data) \
215 void lttng_ust_tracepoint_register_##_provider##___##_name(char *provider_name, char *event_name, \
216 void (*func)(void), void *data) \
218 lttng_ust_tracepoint_probe_register(provider_name, event_name, func, data, \
219 lttng_ust_tracepoint_##_provider##___##_name.signature); \
222 void lttng_ust_tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
223 void (*func)(void), void *data) \
226 void lttng_ust_tracepoint_unregister_##_provider##___##_name(char *provider_name, char *event_name, \
227 void (*func)(void), void *data) \
229 lttng_ust_tracepoint_probe_unregister(provider_name, event_name, func, data); \
232 extern int lttng_ust_tracepoint_probe_register(const char *provider_name
, const char *event_name
,
233 void (*func
)(void), void *data
, const char *signature
);
234 extern int lttng_ust_tracepoint_probe_unregister(const char *provider_name
, const char *event_name
,
235 void (*func
)(void), void *data
);
238 * tracepoint dynamic linkage handling (callbacks). Hidden visibility:
239 * shared across objects in a module/main executable.
241 * IMPORTANT: this structure is part of the ABI between instrumented
242 * applications and UST. Fields need to be only added at the end, never
243 * reordered, never removed.
245 * The field @struct_size should be used to determine the size of the
246 * structure. It should be queried before using additional fields added
247 * at the end of the structure.
249 struct lttng_ust_tracepoint_dlopen
{
250 uint32_t struct_size
;
252 void *liblttngust_handle
;
254 int (*lttng_ust_tracepoint_register_lib
)(struct lttng_ust_tracepoint
* const *tracepoints_start
,
255 int tracepoints_count
);
256 int (*lttng_ust_tracepoint_unregister_lib
)(struct lttng_ust_tracepoint
* const *tracepoints_start
);
257 void (*rcu_read_lock_sym
)(void);
258 void (*rcu_read_unlock_sym
)(void);
259 void *(*rcu_dereference_sym
)(void *p
);
261 /* End of base ABI. Fields below should be used after checking struct_size. */
264 extern struct lttng_ust_tracepoint_dlopen lttng_ust_tracepoint_dlopen
;
265 extern struct lttng_ust_tracepoint_dlopen
*lttng_ust_tracepoint_dlopen_ptr
;
268 * These weak symbols, the constructor, and destructor take care of
269 * registering only _one_ instance of the tracepoints per shared-ojbect
270 * (or for the whole main program).
272 int lttng_ust_tracepoint_registered
273 __attribute__((weak
, visibility("hidden")));
274 int lttng_ust_tracepoint_ptrs_registered
275 __attribute__((weak
, visibility("hidden")));
276 struct lttng_ust_tracepoint_dlopen lttng_ust_tracepoint_dlopen
277 __attribute__((weak
, visibility("hidden"))) = {
278 .struct_size
= sizeof(struct lttng_ust_tracepoint_dlopen
),
281 * Deal with gcc O1 optimisation issues with weak hidden symbols. gcc
282 * 4.8 and prior does not have the same behavior for symbol scoping on
283 * 32-bit powerpc depending on the object size: symbols for objects of 8
284 * bytes or less have the same address throughout a module, whereas they
285 * have different addresses between compile units for objects larger
286 * than 8 bytes. Add this pointer indirection to ensure that the symbol
287 * scoping match that of the other weak hidden symbols found in this
290 struct lttng_ust_tracepoint_dlopen
*lttng_ust_tracepoint_dlopen_ptr
291 __attribute__((weak
, visibility("hidden")));
294 * Tracepoint dynamic linkage handling (callbacks). Hidden visibility: shared
295 * across objects in a module/main executable. The callbacks are used to
296 * control and check if the destructors should be executed.
298 * IMPORTANT: this structure is part of the ABI between instrumented
299 * applications and UST. Fields need to be only added at the end, never
300 * reordered, never removed.
302 * The field @struct_size should be used to determine the size of the
303 * structure. It should be queried before using additional fields added
304 * at the end of the structure.
306 struct lttng_ust_tracepoint_destructors_syms
{
307 uint32_t struct_size
;
309 void (*tracepoint_disable_destructors
)(void);
310 int (*tracepoint_get_destructors_state
)(void);
312 /* End of base ABI. Fields below should be used after checking struct_size. */
315 extern struct lttng_ust_tracepoint_destructors_syms lttng_ust_tracepoint_destructors_syms
;
316 extern struct lttng_ust_tracepoint_destructors_syms
*lttng_ust_tracepoint_destructors_syms_ptr
;
318 struct lttng_ust_tracepoint_destructors_syms lttng_ust_tracepoint_destructors_syms
319 __attribute__((weak
, visibility("hidden"))) = {
320 .struct_size
= sizeof(struct lttng_ust_tracepoint_destructors_syms
),
322 struct lttng_ust_tracepoint_destructors_syms
*lttng_ust_tracepoint_destructors_syms_ptr
323 __attribute__((weak
, visibility("hidden")));
325 static inline void tracepoint_disable_destructors(void)
327 if (!lttng_ust_tracepoint_dlopen_ptr
)
328 lttng_ust_tracepoint_dlopen_ptr
= <tng_ust_tracepoint_dlopen
;
329 if (!lttng_ust_tracepoint_destructors_syms_ptr
)
330 lttng_ust_tracepoint_destructors_syms_ptr
= <tng_ust_tracepoint_destructors_syms
;
331 if (lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
332 && lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_disable_destructors
)
333 lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_disable_destructors();
338 lttng_ust_tracepoint__init_urcu_sym(void)
341 lttng_ust_tracepoint__init_urcu_sym(void)
343 if (!lttng_ust_tracepoint_dlopen_ptr
)
344 lttng_ust_tracepoint_dlopen_ptr
= <tng_ust_tracepoint_dlopen
;
346 * Symbols below are needed by tracepoint call sites and probe
349 if (!lttng_ust_tracepoint_dlopen_ptr
->rcu_read_lock_sym
)
350 lttng_ust_tracepoint_dlopen_ptr
->rcu_read_lock_sym
=
351 URCU_FORCE_CAST(void (*)(void),
352 dlsym(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
,
353 "lttng_ust_tp_rcu_read_lock"));
354 if (!lttng_ust_tracepoint_dlopen_ptr
->rcu_read_unlock_sym
)
355 lttng_ust_tracepoint_dlopen_ptr
->rcu_read_unlock_sym
=
356 URCU_FORCE_CAST(void (*)(void),
357 dlsym(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
,
358 "lttng_ust_tp_rcu_read_unlock"));
359 if (!lttng_ust_tracepoint_dlopen_ptr
->rcu_dereference_sym
)
360 lttng_ust_tracepoint_dlopen_ptr
->rcu_dereference_sym
=
361 URCU_FORCE_CAST(void *(*)(void *p
),
362 dlsym(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
,
363 "lttng_ust_tp_rcu_dereference_sym"));
367 lttng_ust_tracepoint__init_urcu_sym(void)
370 lttng_ust_tracepoint__init_urcu_sym(void)
376 lttng_ust__tracepoints__init(void)
377 lttng_ust_notrace
__attribute__((constructor
));
379 lttng_ust__tracepoints__init(void)
381 if (lttng_ust_tracepoint_registered
++) {
382 if (!lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
)
384 lttng_ust_tracepoint__init_urcu_sym();
388 if (!lttng_ust_tracepoint_dlopen_ptr
)
389 lttng_ust_tracepoint_dlopen_ptr
= <tng_ust_tracepoint_dlopen
;
390 if (!lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
)
391 lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
=
392 dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME
, RTLD_NOW
| RTLD_GLOBAL
);
393 if (!lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
)
395 lttng_ust_tracepoint__init_urcu_sym();
399 lttng_ust__tracepoints__destroy(void)
400 lttng_ust_notrace
__attribute__((destructor
));
402 lttng_ust__tracepoints__destroy(void)
406 if (--lttng_ust_tracepoint_registered
)
408 if (!lttng_ust_tracepoint_dlopen_ptr
)
409 lttng_ust_tracepoint_dlopen_ptr
= <tng_ust_tracepoint_dlopen
;
410 if (!lttng_ust_tracepoint_destructors_syms_ptr
)
411 lttng_ust_tracepoint_destructors_syms_ptr
= <tng_ust_tracepoint_destructors_syms
;
412 if (!lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
)
414 if (lttng_ust_tracepoint_ptrs_registered
)
417 * Lookup if destructors must be executed using the new method.
419 if (lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_get_destructors_state
420 && !lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_get_destructors_state()) {
422 * The tracepoint_get_destructors_state symbol was found with
423 * dlsym but its returned value is 0 meaning that destructors
424 * must not be executed.
428 ret
= dlclose(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
);
430 fprintf(stderr
, "Error (%d) in dlclose\n", ret
);
433 memset(lttng_ust_tracepoint_dlopen_ptr
, 0, sizeof(*lttng_ust_tracepoint_dlopen_ptr
));
436 #if LTTNG_UST_COMPAT_API(0)
437 # if defined(TRACEPOINT_DEFINE) && !defined(LTTNG_UST_TRACEPOINT_DEFINE)
438 # define LTTNG_UST_TRACEPOINT_DEFINE
440 #endif /* #if LTTNG_UST_COMPAT_API(0) */
442 #ifdef LTTNG_UST_TRACEPOINT_DEFINE
445 * These weak symbols, the constructor, and destructor take care of
446 * registering only _one_ instance of the tracepoints per shared-ojbect
447 * (or for the whole main program).
449 extern struct lttng_ust_tracepoint
* const __start_lttng_ust_tracepoints_ptrs
[]
450 __attribute__((weak
, visibility("hidden")));
451 extern struct lttng_ust_tracepoint
* const __stop_lttng_ust_tracepoints_ptrs
[]
452 __attribute__((weak
, visibility("hidden")));
455 * When LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a
456 * unresolved symbol that requires the provider to be linked in. When
457 * LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an
458 * unresolved symbol that depends on having the provider linked in,
459 * otherwise the linker complains. This deals with use of static
460 * libraries, ensuring that the linker does not remove the provider
461 * object from the executable.
464 #if LTTNG_UST_COMPAT_API(0)
465 # if defined(TRACEPOINT_PROBE_DYNAMIC_LINKAGE) && !defined(LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE)
466 # define LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE
468 #endif /* #if LTTNG_UST_COMPAT_API(0) */
470 #ifdef LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE
471 #define LTTNG_UST__TRACEPOINT_UNDEFINED_REF(provider) NULL
472 #else /* LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
473 #define LTTNG_UST__TRACEPOINT_UNDEFINED_REF(provider) <tng_ust_tracepoint_provider_##provider
474 #endif /* LTTNG_UST_TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
477 * Note: to allow PIC code, we need to allow the linker to update the pointers
478 * in the lttng_ust_tracepoints_ptrs section.
479 * Therefore, this section is _not_ const (read-only).
481 #define LTTNG_UST__TP_EXTRACT_STRING(...) #__VA_ARGS__
483 #define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args) \
484 lttng_ust_tracepoint_validate_name_len(_provider, _name); \
485 extern int lttng_ust_tracepoint_provider_##_provider; \
486 static const char lttng_ust_tp_provider_strtab_##_provider##___##_name[] \
487 __attribute__((section("lttng_ust_tracepoints_strings"))) = \
489 static const char lttng_ust_tp_name_strtab_##_provider##___##_name[] \
490 __attribute__((section("lttng_ust_tracepoints_strings"))) = \
492 struct lttng_ust_tracepoint lttng_ust_tracepoint_##_provider##___##_name \
493 __attribute__((section("lttng_ust_tracepoints"))) = { \
494 sizeof(struct lttng_ust_tracepoint), \
495 lttng_ust_tp_provider_strtab_##_provider##___##_name, \
496 lttng_ust_tp_name_strtab_##_provider##___##_name, \
499 LTTNG_UST__TRACEPOINT_UNDEFINED_REF(_provider), \
500 LTTNG_UST__TP_EXTRACT_STRING(_args), \
502 static struct lttng_ust_tracepoint * \
503 lttng_ust_tracepoint_ptr_##_provider##___##_name \
504 __attribute__((section("lttng_ust_tracepoints_ptrs"), used)) \
505 __lttng_ust_variable_attribute_no_sanitize_address = \
506 <tng_ust_tracepoint_##_provider##___##_name;
509 lttng_ust__tracepoints__ptrs_init(void)
510 lttng_ust_notrace
__attribute__((constructor
));
512 lttng_ust__tracepoints__ptrs_init(void)
514 if (lttng_ust_tracepoint_ptrs_registered
++)
516 if (!lttng_ust_tracepoint_dlopen_ptr
)
517 lttng_ust_tracepoint_dlopen_ptr
= <tng_ust_tracepoint_dlopen
;
518 if (!lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
)
519 lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
=
520 dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME
, RTLD_NOW
| RTLD_GLOBAL
);
521 if (!lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
)
523 if (!lttng_ust_tracepoint_destructors_syms_ptr
)
524 lttng_ust_tracepoint_destructors_syms_ptr
= <tng_ust_tracepoint_destructors_syms
;
525 lttng_ust_tracepoint_dlopen_ptr
->lttng_ust_tracepoint_register_lib
=
526 URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint
* const *, int),
527 dlsym(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
,
528 "lttng_ust_tracepoint_register_lib"));
529 lttng_ust_tracepoint_dlopen_ptr
->lttng_ust_tracepoint_unregister_lib
=
530 URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint
* const *),
531 dlsym(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
,
532 "lttng_ust_tracepoint_unregister_lib"));
533 lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_disable_destructors
=
534 URCU_FORCE_CAST(void (*)(void),
535 dlsym(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
,
536 "lttng_ust_tp_disable_destructors"));
537 lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_get_destructors_state
=
538 URCU_FORCE_CAST(int (*)(void),
539 dlsym(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
,
540 "lttng_ust_tp_get_destructors_state"));
541 lttng_ust_tracepoint__init_urcu_sym();
542 if (lttng_ust_tracepoint_dlopen_ptr
->lttng_ust_tracepoint_register_lib
) {
543 lttng_ust_tracepoint_dlopen_ptr
->lttng_ust_tracepoint_register_lib(__start_lttng_ust_tracepoints_ptrs
,
544 __stop_lttng_ust_tracepoints_ptrs
-
545 __start_lttng_ust_tracepoints_ptrs
);
550 lttng_ust__tracepoints__ptrs_destroy(void)
551 lttng_ust_notrace
__attribute__((destructor
));
553 lttng_ust__tracepoints__ptrs_destroy(void)
557 if (--lttng_ust_tracepoint_ptrs_registered
)
559 if (!lttng_ust_tracepoint_dlopen_ptr
)
560 lttng_ust_tracepoint_dlopen_ptr
= <tng_ust_tracepoint_dlopen
;
561 if (!lttng_ust_tracepoint_destructors_syms_ptr
)
562 lttng_ust_tracepoint_destructors_syms_ptr
= <tng_ust_tracepoint_destructors_syms
;
563 if (lttng_ust_tracepoint_dlopen_ptr
->lttng_ust_tracepoint_unregister_lib
)
564 lttng_ust_tracepoint_dlopen_ptr
->lttng_ust_tracepoint_unregister_lib(__start_lttng_ust_tracepoints_ptrs
);
565 if (lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
566 && lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_get_destructors_state
567 && lttng_ust_tracepoint_destructors_syms_ptr
->tracepoint_get_destructors_state()
568 && !lttng_ust_tracepoint_ptrs_registered
) {
569 ret
= dlclose(lttng_ust_tracepoint_dlopen_ptr
->liblttngust_handle
);
571 fprintf(stderr
, "Error (%d) in dlclose\n", ret
);
574 memset(lttng_ust_tracepoint_dlopen_ptr
, 0, sizeof(*lttng_ust_tracepoint_dlopen_ptr
));
578 #else /* LTTNG_UST_TRACEPOINT_DEFINE */
580 #define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args)
582 #endif /* #else LTTNG_UST_TRACEPOINT_DEFINE */
584 #if LTTNG_UST_COMPAT_API(0)
585 #define tracepoint lttng_ust_tracepoint
586 #define do_tracepoint lttng_ust_do_tracepoint
587 #define tracepoint_enabled lttng_ust_tracepoint_enabled
588 #define TP_ARGS LTTNG_UST_TP_ARGS
589 #define TP_FIELDS LTTNG_UST_TP_FIELDS
591 #define ctf_integer lttng_ust_field_integer
592 #define ctf_integer_hex lttng_ust_field_integer_hex
593 #define ctf_integer_network lttng_ust_field_integer_network
594 #define ctf_integer_network_hex lttng_ust_field_integer_network_hex
595 #define ctf_integer_nowrite lttng_ust_field_integer_nowrite
597 #define ctf_float lttng_ust_field_float
598 #define ctf_float_nowrite lttng_ust_field_float_nowrite
600 #define ctf_array lttng_ust_field_array
601 #define ctf_array_hex lttng_ust_field_array_hex
602 #define ctf_array_network lttng_ust_field_array_network
603 #define ctf_array_network_hex lttng_ust_field_array_network_hex
604 #define ctf_array_text lttng_ust_field_array_text
605 #define ctf_array_nowrite lttng_ust_field_array_nowrite
606 #define ctf_array_nowrite_hex lttng_ust_field_array_nowrite_hex
607 #define ctf_array_network_nowrite lttng_ust_field_array_network_nowrite
608 #define ctf_array_network_nowrite_hex lttng_ust_field_array_network_nowrite_hex
609 #define ctf_array_text_nowrite lttng_ust_field_array_text_nowrite
610 #endif /* #if LTTNG_UST_COMPAT_API(0) */
616 #endif /* _LTTNG_TRACEPOINT_H */
618 /* The following declarations must be outside re-inclusion protection. */
620 #ifndef LTTNG_UST_TRACEPOINT_ENUM
623 * Tracepoint Enumerations
625 * The enumeration is a mapping between an integer, or range of integers, and
626 * a string. It can be used to have a more compact trace in cases where the
627 * possible values for a field are limited:
631 * LTTNG_UST_TRACEPOINT_ENUM(someproject_component, enumname,
632 * LTTNG_UST_TP_ENUM_VALUES(
633 * ctf_enum_value("even", 0)
634 * ctf_enum_value("uneven", 1)
635 * ctf_enum_range("twoto4", 2, 4)
636 * ctf_enum_value("five", 5)
640 * Where "someproject_component" is the name of the component this enumeration
641 * belongs to and "enumname" identifies this enumeration. Inside the
642 * LTTNG_UST_TP_ENUM_VALUES macro is the actual mapping. Each string value can map
643 * to either a single value with ctf_enum_value or a range of values
644 * with ctf_enum_range.
646 * Enumeration ranges may overlap, but the behavior is implementation-defined,
647 * each trace reader will handle overlapping as it wishes.
649 * That enumeration can then be used in a field inside the TP_FIELD macro using
650 * the following line:
652 * ctf_enum(someproject_component, enumname, enumtype, enumfield, enumval)
654 * Where "someproject_component" and "enumname" match those in the
655 * LTTNG_UST_TRACEPOINT_ENUM, "enumtype" is a signed or unsigned integer type
656 * backing the enumeration, "enumfield" is the name of the field and
657 * "enumval" is the value.
660 #define LTTNG_UST_TRACEPOINT_ENUM(provider, name, values)
662 #if LTTNG_UST_COMPAT_API(0)
663 #define TRACEPOINT_ENUM LTTNG_UST_TRACEPOINT_ENUM
664 #endif /* #if LTTNG_UST_COMPAT_API(0) */
666 #endif /* #ifndef LTTNG_UST_TRACEPOINT_ENUM */
668 #ifndef LTTNG_UST_TRACEPOINT_EVENT
671 * How to use the LTTNG_UST_TRACEPOINT_EVENT macro:
675 * LTTNG_UST_TRACEPOINT_EVENT(someproject_component, event_name,
677 * * LTTNG_UST_TP_ARGS takes from 0 to 10 "type, field_name" pairs *
679 * LTTNG_UST_TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen,
680 * long *, arg4, size_t, arg4_len),
682 * * LTTNG_UST_TP_FIELDS describes the event payload layout in the trace *
684 * LTTNG_UST_TP_FIELDS(
685 * * Integer, printed in base 10 *
686 * lttng_ust_field_integer(int, field_a, arg0)
688 * * Integer, printed with 0x base 16 *
689 * lttng_ust_field_integer_hex(unsigned long, field_d, arg1)
692 * ctf_enum(someproject_component, enum_name, int, field_e, arg0)
694 * * Array Sequence, printed as UTF8-encoded array of bytes *
695 * lttng_ust_field_array_text(char, field_b, string, FIXED_LEN)
696 * ctf_sequence_text(char, field_c, string, size_t, strlen)
698 * * String, printed as UTF8-encoded string *
699 * ctf_string(field_e, string)
701 * * Array sequence of signed integer values *
702 * lttng_ust_field_array(long, field_f, arg4, FIXED_LEN4)
703 * ctf_sequence(long, field_g, arg4, size_t, arg4_len)
707 * More detailed explanation:
709 * The name of the tracepoint is expressed as a tuple with the provider
710 * and name arguments.
712 * The provider and name should be a proper C99 identifier.
713 * The "provider" and "name" MUST follow these rules to ensure no
714 * namespace clash occurs:
716 * For projects (applications and libraries) for which an entity
717 * specific to the project controls the source code and thus its
718 * tracepoints (typically with a scope larger than a single company):
721 * project_component, event
725 * Where "project" is the name of the project,
726 * "component" is the name of the project component (which may
727 * include several levels of sub-components, e.g.
728 * ...component_subcomponent_...) where the tracepoint is located
730 * "event" is the name of the tracepoint event.
732 * For projects issued from a single company wishing to advertise that
733 * the company controls the source code and thus the tracepoints, the
734 * "com_" prefix should be used:
737 * com_company_project_component, event
739 * com_company_project, event
741 * Where "company" is the name of the company,
742 * "project" is the name of the project,
743 * "component" is the name of the project component (which may
744 * include several levels of sub-components, e.g.
745 * ...component_subcomponent_...) where the tracepoint is located
747 * "event" is the name of the tracepoint event.
749 * the provider:event identifier is limited to 127 characters.
752 #define LTTNG_UST_TRACEPOINT_EVENT(provider, name, args, fields) \
753 LTTNG_UST__DECLARE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args)) \
754 LTTNG_UST__DEFINE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args))
756 #define LTTNG_UST_TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
758 #define LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \
759 LTTNG_UST__DECLARE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args)) \
760 LTTNG_UST__DEFINE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args))
762 #if LTTNG_UST_COMPAT_API(0)
763 #define TRACEPOINT_EVENT LTTNG_UST_TRACEPOINT_EVENT
764 #define TRACEPOINT_EVENT_CLASS LTTNG_UST_TRACEPOINT_EVENT_CLASS
765 #define TRACEPOINT_EVENT_INSTANCE LTTNG_UST_TRACEPOINT_EVENT_INSTANCE
766 #endif /* #if LTTNG_UST_COMPAT_API(0) */
768 #endif /* #ifndef LTTNG_UST_TRACEPOINT_EVENT */
770 #ifndef LTTNG_UST_TRACEPOINT_LOGLEVEL
773 * Tracepoint Loglevels
775 * Typical use of these loglevels:
777 * The loglevels go from 0 to 14. Higher numbers imply the most
778 * verbosity (higher event throughput expected.
780 * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels
781 * semantic. Loglevels 7 through 13 offer more fine-grained selection of
784 * LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG 0
787 * LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT 1
788 * action must be taken immediately
790 * LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT 2
791 * critical conditions
793 * LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR 3
796 * LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING 4
799 * LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE 5
800 * normal, but significant, condition
802 * LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO 6
803 * informational message
805 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM 7
806 * debug information with system-level scope (set of programs)
808 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM 8
809 * debug information with program-level scope (set of processes)
811 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS 9
812 * debug information with process-level scope (set of modules)
814 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE 10
815 * debug information with module (executable/library) scope (set of units)
817 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT 11
818 * debug information with compilation unit scope (set of functions)
820 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION 12
821 * debug information with function-level scope
823 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE 13
824 * debug information with line-level scope (LTTNG_UST_TRACEPOINT_EVENT default)
826 * LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG 14
827 * debug-level message
829 * Declare tracepoint loglevels for tracepoints. A LTTNG_UST_TRACEPOINT_EVENT
830 * should be declared prior to the the LTTNG_UST_TRACEPOINT_LOGLEVEL for a given
831 * tracepoint name. The first field is the provider name, the second
832 * field is the name of the tracepoint, the third field is the loglevel
835 * LTTNG_UST_TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >,
838 * The LTTNG_UST_TRACEPOINT_PROVIDER must be already declared before declaring a
839 * LTTNG_UST_TRACEPOINT_LOGLEVEL.
843 LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG
= 0,
844 LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT
= 1,
845 LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT
= 2,
846 LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR
= 3,
847 LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING
= 4,
848 LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE
= 5,
849 LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO
= 6,
850 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM
= 7,
851 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM
= 8,
852 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS
= 9,
853 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE
= 10,
854 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT
= 11,
855 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION
= 12,
856 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE
= 13,
857 LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG
= 14,
860 #define LTTNG_UST_TRACEPOINT_LOGLEVEL(provider, name, loglevel)
862 #if LTTNG_UST_COMPAT_API(0)
863 #define TRACEPOINT_LOGLEVEL LTTNG_UST_TRACEPOINT_LOGLEVEL
865 #define TRACE_EMERG LTTNG_UST_TRACEPOINT_LOGLEVEL_EMERG
866 #define TRACE_ALERT LTTNG_UST_TRACEPOINT_LOGLEVEL_ALERT
867 #define TRACE_CRIT LTTNG_UST_TRACEPOINT_LOGLEVEL_CRIT
868 #define TRACE_ERR LTTNG_UST_TRACEPOINT_LOGLEVEL_ERR
869 #define TRACE_WARNING LTTNG_UST_TRACEPOINT_LOGLEVEL_WARNING
870 #define TRACE_NOTICE LTTNG_UST_TRACEPOINT_LOGLEVEL_NOTICE
871 #define TRACE_INFO LTTNG_UST_TRACEPOINT_LOGLEVEL_INFO
872 #define TRACE_DEBUG_SYSTEM LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_SYSTEM
873 #define TRACE_DEBUG_PROGRAM LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROGRAM
874 #define TRACE_DEBUG_PROCESS LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_PROCESS
875 #define TRACE_DEBUG_MODULE LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_MODULE
876 #define TRACE_DEBUG_UNIT LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_UNIT
877 #define TRACE_DEBUG_FUNCTION LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_FUNCTION
878 #define TRACE_DEBUG_LINE LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG_LINE
879 #define TRACE_DEBUG LTTNG_UST_TRACEPOINT_LOGLEVEL_DEBUG
882 #endif /* #ifndef LTTNG_UST_TRACEPOINT_LOGLEVEL */
884 #ifndef LTTNG_UST_TRACEPOINT_MODEL_EMF_URI
886 #define LTTNG_UST_TRACEPOINT_MODEL_EMF_URI(provider, name, uri)
888 #if LTTNG_UST_COMPAT_API(0)
889 #define TRACEPOINT_MODEL_EMF_URI LTTNG_UST_TRACEPOINT_MODEL_EMF_URI
892 #endif /* #ifndef LTTNG_UST_TRACEPOINT_MODEL_EMF_URI */